According to most contemporary theories of justice, justice is overwhelmingly important: John Rawls claims that "Justice is the first virtue of social institutions, as truth is of systems of thought." Justice can be thought of as distinct from benevolence, charity, prudence, mercy, generosity, or compassion, although these dimensions are regularly understood to also be interlinked. Justice is connected to the concept of cardinal virtues, of which it is one. Justice has traditionally been associated with concepts of fate, reincarnation or Divine Providence, i.e. with a life in accordance with the cosmic plan. The association of justice with fairness has thus been historically and culturally rare and is perhaps chiefly a modern innovation [in western societies].

Studies at UCLA in 2008 have indicated that reactions to fairness are "wired" into the brain and that, "Fairness is activating the same part of the brain that responds to food in rats. This is consistent with the notion that being treated fairly satisfies a basic need". Research conducted in 2003 at Emory University, Georgia, USA, involving Capuchin Monkeys demonstrated that other cooperative animals also possess such a sense and that "inequity aversion may not be uniquely human" indicating that ideas of fairness and justice may be instinctual in nature.

Variations of justice

Utilitarianism is a form of consequentialism, where punishment is forward-looking. Justified by the ability to achieve future social benefits resulting in crime reduction, the moral worth of an action is determined by its outcome.

Retributive justice regulates proportionate response to crime proven by lawful evidence, so that punishment is justly imposed and considered as morally correct and fully deserved. The law of retaliation (lex talionis) is a military theory of retributive justice, which says that reciprocity should be equal to the wrong suffered; "life for life, wound for wound, stripe for stripe."

Restorative justice is concerned not so much with retribution and punishment as with (a) making the victim whole and (b) reintegrating the offender into society. This approach frequently brings an offender and a victim together, so that the offender can better understand the effect his/her offense had on the victim.

Distributive justice is directed at the proper allocation of things—wealth, power, reward, respect—among different people.

Understandings of justice

Understandings of justice differ in every culture, as cultures are usually dependent upon a shared history, mythology and/or religion. Each culture's ethics create values that influence the notion of justice. Although there can be found some justice principles that are one and the same in all or most of the cultures, these are insufficient to create a unitary justice apprehension.

In his dialogue Republic, Plato uses Socrates to argue for justice that covers both the just person and the just City State. Justice is a proper, harmonious relationship between the warring parts of the person or city. Hence Plato's definition of justice is that justice is the having and doing of what is one's own.

A just man is a man in just the right place, doing his best and giving the precise equivalent of what he has received. This applies both at the individual level and at the universal level. A person's soul has three parts – reason, spirit and desire. Similarly, a city has three parts – Socrates uses the parable of the chariot to illustrate his point: a chariot works as a whole because the two horses’ power is directed by the charioteer. Lovers of wisdom – philosophers, in one sense of the term – should rule because only they understand what is good.

If one is ill, one goes to a doctor rather than a psychologist, because the doctor is expert in the subject of health. Similarly, one should trust one's city to an expert in the subject of the good, not to a mere politician who tries to gain power by giving people what they want, rather than what's good for them. Socrates uses the parable of the ship to illustrate this point: the unjust city is like a ship in open ocean, crewed by a powerful but drunken captain (the common people), a group of untrustworthy advisors who try to manipulate the captain into giving them power over the ship's course (the politicians), and a navigator (the philosopher) who is the only one who knows how to get the ship to port. For Socrates, the only way the ship will reach its destination – the good – is if the navigator takes charge.

Justice as a divine law is commanding, and indeed the whole of morality, is the authoritative command. Killing is wrong and therefore must be punished and if not punished what should be done? A famous paradox called the Euthyphro dilemma essentially asks: is something right because God commands it, or does God command it because it's right? If the former, then justice is arbitrary; if the latter, then morality exists on a higher order than God, who becomes little more than a passer-on of moral knowledge. The dilemma is however claimed to be false by some religious apologists, who claim that goodness is the very nature of God and is necessarily expressed in His commands. Another response is that the laws and moral principles are objective and self-evident in nature. God embodies these laws and is therefore neither higher nor lower than the law. He sets an example for the good people among men to follow His way and also become an embodiment of the highest principles and morals.

For advocates of the theory that justice is part of natural law (e.g., John Locke), it involves the system of consequences that naturally derives from any action or choice. In this, it is similar to the laws of physics: in the same way as the Third of Newton's laws of Motion requires that for every action there must be an equal and opposite reaction, justice requires according individuals or groups what they actually deserve, merit, or are entitled to. Justice, on this account, is a universal and absolute concept: laws, principles, religions, etc., are merely attempts to codify that concept, sometimes with results that entirely contradict the true nature of justice.

Justice as human creation In contrast to the understandings canvassed so far, justice may be understood as a human creation, rather than a discovery of harmony, divine command, or natural law. This claim can be understood in a number of ways, with the fundamental division being between those who argue that justice is the creation of some humans, and those who argue that it is the creation of all humans.

Justice as trickery In Republic by Plato, the character Thrasymachus argues that justice is the interest of the strong—merely a name for what the powerful or cunning ruler has imposed on the people.

According to thinkers in the social contract tradition, justice is derived from the mutual agreement of everyone concerned; or, in many versions, from what they would agree to under hypothetical conditions including equality and absence of bias. This account is considered further below, under ‘Justice as fairness’.

Justice as a subordinate value According to utilitarian thinkers including John Stuart Mill, justice is not as fundamental as we often think. Rather, it is derived from the more basic standard of rightness, consequentialism: what is right is what has the best consequences (usually measured by the total or average welfare caused). So, the proper principles of justice are those that tend to have the best consequences. These rules may turn out to be familiar ones such as keeping contracts; but equally, they may not, depending on the facts about real consequences. Either way, what is important is those consequences, and justice is important, if at all, only as derived from that fundamental standard. Mill tries to explain our mistaken belief that justice is overwhelmingly important by arguing that it derives from two natural human tendencies: our desire to retaliate against those who hurt us, and our ability to put ourselves imaginatively in another's place. So, when we see someone harmed, we project ourselves into her situation and feel a desire to retaliate on her behalf. If this process is the source of our feelings about justice, that ought to undermine our confidence in them.

1. What goods are to be distributed? Is it to be wealth, power, respect, some combination of these things?

2. Between what entities are they to be distributed? Humans (dead, living, future), sentientbeings, the members of a single society, nations?

3. What is the proper distribution? Equal, meritocratic, according to social status, according toneed, based on property rights and non-aggression?

Distributive justice theorists generally do not answer questions of who has the right to enforce a particular favored distribution. On the other hand, property rights theorists argue that there is no "favored distribution." Rather, distribution should be based simply on whatever distribution results from non-coerced interactions or transactions (that is, transactions not based upon force or fraud).

This section describes some widely held theories of distributive justice, and their attempts to answer these questions.

According to the egalitarian, justice can only exist within the coordinates of equality. This basic view can be elaborated in many different ways, according to what goods are to be distributed—wealth, respect, opportunity—and what they are to be distributed equally between—individuals, families, nations, races, species. Commonly held egalitarian positions include demands for equality of opportunity and for equality of outcome. It affirms that freedom and justice without equality are hollow and that equality itself is the highest justice.

At a cultural level, egalitarian theories have developed in sophistication and acceptance during the past two hundred years. Among the notable broadly egalitarian philosophies are socialism, communism, anarchism, left-libertarianism, and progressivism, all of which propound economic, political, and legal egalitarianism, respectively. Several egalitarian ideas enjoy wide support among intellectuals and in the general populations of many countries. Whether any of these ideas have been significantly implemented in practice, however, remains a controversial question. One argument is that liberalism provides democracy with the experience of civic reformism. Without it, democracy loses any tie─argumentative or practical─to a coherent design of public policy endeavoring to provide the resources for the realization of democratic citizenship.

Giving people what they deserve In one sense, all theories of distributive justice claim that everyone should get what they deserve. Theories disagree on the basis for deserving. The main distinction is between theories that argue the basis of just deserts is held equally by everyone, and therefore derive egalitarian accounts of distributive justice—and theories that argue the basis of just deserts is unequally distributed on the basis of, for instance, hard work, and therefore derive accounts of distributive justice by which some should have more than others. This section deals with some popular theories of the second type.

According to meritocratic theories, goods, especially wealth and social status, should be distributed to match individual merit, which is usually understood as some combination of talent and hard work. According to needs-based theories, goods, especially such basic goods as food, shelter and medical care, should be distributed to meet individuals' basic needs for them. Marxism can be regarded as a needs-based theory on some readings of Marx's slogan "from each according to his ability, to each according to his need".[16] According to contribution-based theories, goods should be distributed to match an individual's contribution to the overall social good.

In his A Theory of Justice, John Rawls used a social contract argument to show that justice, and especially distributive justice, is a form of fairness: an impartial distribution of goods. Rawls asks us to imagine ourselves behind a veil of ignorance that denies us all knowledge of our personalities, social statuses, moral characters, wealth, talents and life plans, and then asks what theory of justice we would choose to govern our society when the veil is lifted, if we wanted to do the best that we could for ourselves. We don’t know who in particular we are, and therefore can’t bias the decision in our own favour. So, the decision-in-ignorance models fairness, because it excludes selfish bias. Rawls argues that each of us would reject the utilitarian theory of justice that we should maximize welfare (see below) because of the risk that we might turn out to be someone whose own good is sacrificed for greater benefits for others. Instead, we would endorse Rawls's two principles of justice:

· Each person is to have an equal right to the most extensive total system of equal basic liberties compatible with a similar system of liberty for all.

· Social and economic inequalities are to be arranged so that they are both

· to the greatest benefit of the least advantaged, consistent with the just savings principle, and

· attached to offices and positions open to all under conditions of fair equality of opportunity.

This imagined choice justifies these principles as the principles of justice for us, because we would agree to them in a fair decision procedure. Rawls's theory distinguishes two kinds of goods – (1)liberties and (2) social and economic goods, i.e. wealth, income and power – and applies different distributions to them – equality between citizens for (1), equality unless inequality improves the position of the worst off for (2).

Property rights (non-coercion); having the right history Robert Nozick's influential critique of Rawls argues that distributive justice is not a matter of the whole distribution matching an ideal pattern, but of each individual entitlement having the right kind of history. It is just that a person has some good (especially, some property right) if and only if they came to have it by a history made up entirely of events of two kinds:

1. Just acquisition, especially by working on unowned things; and

2. Just transfer, that is free gift, sale or other agreement, but not theft (i.e. by force or fraud).

If the chain of events leading up to the person having something meets this criterion, they are entitled to it: that they possess it is just, and what anyone else does or doesn't have or need is irrelevant.

On the basis of this theory of distributive justice, Nozick argues that all attempts to redistribute goods according to an ideal pattern, without the consent of their owners, are theft. In particular, redistributive taxation is theft.

Some property rights theorists also take a consequentialist view of distributive justice and argue that property rights based justice also has the effect of maximizing the overall wealth of an economic system. They explain that voluntary (non-coerced) transactions always have a property calledpareto efficiency. A pareto efficient transaction is one where at least one party ends up better off and neither party ends up worse off. The result is that the world is better off in an absolute sense and no one is worse off. Such consequentialist property rights theorists argue that respecting property rights maximizes the number of pareto efficient transactions in the world and minimized the number of non-pareto efficient transactions in the world (i.e. transactions where someone is made worse off). The result is that the world will have generated the greatest total benefit from the limited, scarce resources available in the world. Further, this will have been accomplished without taking anything away from anyone by coercion.

According to the utilitarian, justice requires the maximization of the total or average welfare across all relevant individuals. This may require sacrifice of some for the good of others, so long as everyone's good is taken impartially into account. Utilitarianism, in general, argues that the standard of justification for actions, institutions, or the whole world, is impartial welfare consequentialism, and only indirectly, if at all, to do with rights, property, need, or any other non-utilitarian criterion. These other criteria might be indirectly important, to the extent that human welfare involves them. But even then, such demands as human rights would only be elements in the calculation of overall welfare, not un-crossable barriers to action.

Theories of sentencing

In criminal law, a sentence forms the final explicit act of a judge-ruled process, and also the symbolic principal act connected to his function. The sentence can generally involve a decree of imprisonment, a fine and/or other punishments against a defendantconvicted of a crime. Laws may specify the range of penalties that can be imposed for various offenses, and sentencing guidelines sometimes regulate what punishment within those ranges can be imposed given a certain set of offense and offender characteristics. The most common purposes of sentencing in legal theory are:

Punishment imposed for no reason other than an offense being committed, on the basis that if proportionate, punishment is morally acceptable as a response that satisfies the aggrieved party, their intimates and society.

In civil cases the decision is usually known as a verdict, or judgment, rather than a sentence. Civil cases are settled primarily by means of monetary compensation for harm done ("damages") and orders intended to prevent future harm (for example injunctions). Under some legal systems an award of damages involves some scope for retribution, denunciation and deterrence, by means of additional categories of damages beyond simple compensation, covering a punitive effect, social disapprobation, and potentially, deterrence, and occasionally disgorgement (forfeit of any gain, even if no loss was caused to the other party).

Theories of retributive justice

Theories of retributive justice are concerned with punishment for wrongdoing, and need to answer three questions:

1. why punish?

2. who should be punished?

3. what punishment should they receive?

This section considers the two major accounts of retributive justice, and their answers to these questions. Utilitarian theories look forward to the future consequences of punishment, while retributive theories look back to particular acts of wrongdoing, and attempt to balance them with deserved punishment.

Utilitarianism According to the utilitarian, as already noted, justice requires the maximization of the total or average welfare across all relevant individuals. Punishment is bad treatment of someone, and therefore can't be good in itself, for the utilitarian. But punishment might be a necessary sacrifice that maximizes the overall good in the long term, in one or more of three ways:

1. Deterrence. The credible threat of punishment might lead people to make different choices; well-designed threats might lead people to make choices that maximize welfare.

2. Rehabilitation. Punishment might make bad people into better ones. For the utilitarian, all that 'bad person' can mean is 'person who's likely to cause bad things (like suffering)'. So, utilitarianism could recommend punishment that changes someone such that they are less likely to cause bad things.

3. Security/Incapacitation. Perhaps there are people who are irredeemable causers of bad things. If so, imprisoning them might maximize welfare by limiting their opportunities to cause harm and therefore the benefit lies within protecting society.

So, the reason for punishment is the maximization of welfare, and punishment should be of whomever, and of whatever form and severity, are needed to meet that goal. Worryingly, this may sometimes justify punishing the innocent, or inflicting disproportionately severe punishments, when that will have the best consequences overall (perhaps executing a few suspected shoplifters live on television would be an effective deterrent to shoplifting, for instance). It also suggests that punishment might turn out never to be right, depending on the facts about what actual consequences it has.

Retributivism The retributivist will think the utilitarian's argument disastrously mistaken. If someone does something wrong, we must respond to it, and to him or her, as an individual not as a part of a calculation of overall welfare. To do otherwise is to disrespect him or her as an individual human being. If the crime had victims, it is to disrespect them, too. Wrongdoing must be balanced or made good in some way, and so the criminal deserves to be punished. Retributivism emphasizes retribution – payback – rather than maximization of welfare. Like the theory of distributive justice as giving everyone what they deserve (see above), it links justice with desert. It says that all guilty people, and only guilty people, deserve appropriate punishment. This matches some strong intuitions about just punishment: that it should be proportional to the crime, and that it should be of only andall of the guilty. However, it is sometimes argued that retributivism is merely revenge in disguise. However, there are differences between retribution and revenge: the former is impartial and has a scale of appropriateness, whereas the latter is personal and potentially unlimited in scale.

Restorative justice (also sometimes called "reparative justice") is an approach to justice that focuses on the needs of victims and offenders, instead of satisfying abstract legal principles or punishing the offender. Victims take an active role in the process, while offenders are encouraged to take responsibility for their actions, "to repair the harm they've done—by apologizing, returning stolen money, or community service". It is based on a theory of justice that considers crime and wrongdoing to be an offense against an individual or community rather than the state. Restorative justice that fosters dialogue between victim and offender shows the highest rates of victim satisfaction and offender accountability.

Mixed theories Some modern philosophers have argued that Utilitarian and Retributive theories are not mutually exclusive. For example, Andrew von Hirsch, in his 1976 book Doing Justice, suggested that we have a moral obligation to punish greater crimes more than lesser ones. However, so long as we adhere to that constraint then utilitarian ideals would play a significant secondary role.

Evolutionary perspectives

Evolutionary ethics and an argued evolution of morality suggest evolutionary bases for the concept of justice. Biosocial criminology research argues that human perceptions of what is appropriate criminal justice are based on how to respond to crimes in the ancestral small-group environment and that these responses may not always be appropriate for today's societies.

In a world where people are interconnected but they disagree, institutions are required to instantiate ideals of justice. These institutions may be justified by their approximate instantiation of justice, or they may be deeply unjust when compared with ideal standards — consider the institution of slavery. Justice is an ideal the world fails to live up to, sometimes despite good intentions, sometimes disastrously. The question of institutive justice raises issues of legitimacy, procedure, codification and interpretation, which are considered by legal theorists and by philosophers of law.

Another definition of justice is an independent investigation of truth. In a courtroom, lawyers, the judge and the jury are supposed to be independently investigating the truth of an alleged crime. In physics, a group of physicists examine data and theoretical concepts to consult on what might be the truth or reality of a phenomenon.

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